Feedback and delayed CSI can be as good as perfect CSI

Author

Tandon, Ravi ; Mohajer, Soheil ; Poor, H. Vincent ; Shamai, Shlomo

Author_Institution

Dept. of EE, Princeton Univ., Princeton, NJ, USA

fYear

2012

fDate

10-15 June 2012

Firstpage

2355

Lastpage

2359

Abstract

The degrees of freedom (DoF) region of the two-user MIMO interference channel (IC) is completely characterized in the presence of noiseless channel output feedback from each receiver to its respective transmitter and with the assumption of delayed channel state information (CSI) at the transmitters. It is shown that having output feedback and delayed CSI at the transmitters can strictly enlarge the DoF region when compared to the case in which only delayed CSI is available at the transmitters. Furthermore, cases are identified in which output feedback and delayed CSI alone are sufficient to achieve the DoF region achievable with perfect, instantaneous CSI.

Keywords

MIMO communication; feedback; radiofrequency interference; telecommunication channels; DoF region; degrees of freedom; delayed CSI; delayed channel state information; feedback; noiseless channel output feedback; perfect CSI; two-user MIMO interference channel; Encoding; Interference channels; MIMO; Output feedback; Receivers; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications (ICC), 2012 IEEE International Conference on

Conference_Location

Ottawa, ON

ISSN

1550-3607

Print_ISBN

978-1-4577-2052-9

Electronic_ISBN

1550-3607

Type

conf

DOI

10.1109/ICC.2012.6364171

Filename

6364171